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Commit 75d5cfbe authored by Steven Whitehouse's avatar Steven Whitehouse
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GFS2: Post-VFS scale update for RCU path walk



We can allow a few more cases to use RCU path walking than
originally allowed. It should be possible to also enable
RCU path walking when the glock is already cached. Thats
a bit more complicated though, so left for a future patch.

Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
Cc: Nick Piggin <npiggin@gmail.com>
parent bc015cb8
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+5 −2
Original line number Diff line number Diff line
@@ -80,8 +80,11 @@ int gfs2_check_acl(struct inode *inode, int mask, unsigned int flags)
	struct posix_acl *acl;
	int error;

	if (flags & IPERM_FLAG_RCU)
	if (flags & IPERM_FLAG_RCU) {
		if (!negative_cached_acl(inode, ACL_TYPE_ACCESS))
			return -ECHILD;
		return -EAGAIN;
	}

	acl = gfs2_acl_get(GFS2_I(inode), ACL_TYPE_ACCESS);
	if (IS_ERR(acl))
+5 −5
Original line number Diff line number Diff line
@@ -1026,9 +1026,9 @@ static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)

/**
 * gfs2_permission -
 * @inode:
 * @mask:
 * @nd: passed from Linux VFS, ignored by us
 * @inode: The inode
 * @mask: The mask to be tested
 * @flags: Indicates whether this is an RCU path walk or not
 *
 * This may be called from the VFS directly, or from within GFS2 with the
 * inode locked, so we look to see if the glock is already locked and only
@@ -1044,11 +1044,11 @@ int gfs2_permission(struct inode *inode, int mask, unsigned int flags)
	int error;
	int unlock = 0;

	if (flags & IPERM_FLAG_RCU)
		return -ECHILD;

	ip = GFS2_I(inode);
	if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
		if (flags & IPERM_FLAG_RCU)
			return -ECHILD;
		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
		if (error)
			return error;